Manufacturing method of movable ring of radially straightened sliding bearing

Abstract

The invention provides a manufacturing method of a movable ring of a radially straightened sliding bearing. The method comprises the following steps of acquiring a movable ring manufacturing die whichcomprises a matrix and a sleeve die coaxially placed outside the matrix, wherein an annular space is formed between the matrix and the sleeve die, and an accommodation space is formed among the matrix, the sleeve die and a cover plate; arranging positioning reference, cleaning a to-be-bonded part, and bonding a wear-resistant part to an inner cylindrical surface of the sleeve die; assembling filler: pouring cast tungsten carbide powder into residual gaps of the annular space, putting positioning powder above the cast tungsten carbide powder to form a positioning layer, then placing a certainamount of bonding alloy in proportion, spraying a certain amount of fluxing agent uniformly to the bonding alloy in proportion, and carrying out covering by a cover plate; sintering an assembled and filled die to obtain a movable ring blank; and machining the air-cooled movable ring blank, wherein the dimension of the movable ring meets a designed demand. The service life of the radially straightened sliding bearing can be prolonged, and meanwhile, the machining difficulty and the manufacturing cost are lowered.

Description

technical field [0001] The invention relates to the technical field of metal processing and manufacturing of downhole tools for drilling, in particular to a method for manufacturing a radially righting sliding bearing moving ring of a rotary steerable system. Background technique [0002] Radial righting sliding bearings are vulnerable parts of drilling downhole tools. When maintaining downhole tools, replacing radial righting sliding bearings is one of the main tasks. At present, the radial centralizing sliding bearings of downhole tools are basically radial centralizing carbide sliding bearings (TC bearings for short). The hardness of the alloy is very high (HRA89~92), but because the drilling fluid contains a large amount of solid particles (such as iron ore powder, quartz sand, etc.), these fine particles will affect the static ring and the moving ring of the bearing when passing through the working gap of the centralizing bearing. The wear-resistant materials on the fr...

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Problems solved by technology

Due to technical confidentiality and economic benefits, domestic research and development units have not been able to communicate with each other on key technologies such as TC bearing molds and manufacturing methods, and there are no relevant literature reports, resulting in a variety of TC bearing molds and manufacturing processes, and a high scrap rate. No less, mainly reflected in: the hardness of the base material of the static ring and the dynamic ring is not up to the hardness HRC32~36 required by the downhole tool parts (usually only HRC25~30); the static ring and the dynamic ring are casted with tungsten carbide and copper base There are impurities in the alloy binder (shown as black holes of different sizes), the bonding strength between the hard alloy wear-resistant material and the cast tungsten carbide is low (≤60MPa), and the working life of the sliding bearing is low; secondly, when there is too much cast tungsten carbide, turning Difficult to process (cannot be processed by turning), high manufacturing cost, low cost performance, and cannot meet the needs of actual drilling downhole tools

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